The best way to view BBK's short-tube header X-shape crossover (PN 1460, $169.99) is installed on the car, where it's more obvious that the catalytic converters are undisturbed in their stock locations. Like the rest of the stock Ford exhaust, this BBK crossover pipe uses 23/4-inch-diameter tubing along with the stock clamps. It's great-Ford just happened to section the exhaust system into the right segments. Fitting the aftermarket parts is a cinch.